Patent GB-675363-A (GB)
Abstract: 675,363. Calculating-apparatus. CENTRE D'ETUDES M. B. A. Dec. 11, 1947 [Dec. 12, 1946], No. 32635/47. Class 106 (i). Control mechanism for a calculating machine is operable by a single control member and comprises main and secondary levers, the main lever being fixed relatively to the control lever and being normally locked by a pivoted profile member which is displaced by depression of an amount key and is prevented from returning to its normal position, after an item has been entered, by engagement with the secondary lever so that the control member may be actuated again to cause a total-taking operation. The invention is applied to a full keyboard, independently-operated machine having two totalizers (not described). Items are added into one totalizer, from which a total may be taken, the amount being transmitted to a second totalizer. Specifications 617,346 and 621,390 are referred to. Keyboard. When an amount key 2 is depressed, a pin 54 in its stem co-operates with a notch in a corresponding denominational plate 51 to cam this plate to the right. A stud 50 therein rocks an arm 49 so as to enable the starting key to be operated as described below. At the end of an operation or a cycle of repeated addition operations, the arms 49 are rocked further clockwise and each engages a stud 501 in a plate 51<SP>1</SP> to slide this plate to the right and, through a pivoted bar 53, to restore the plate 51 and any depressed keys. Finally, the arms 49 are restored to their initial positions. Adding. When the arms 49 are rocked by depression of an amount key, a stud in an arm 21 fast with the arms 49 rocks a locking plate 6 counter-clockwise about a pivot 7. An abutment 8 thereon is thus moved from beneath a projection 5 on the main lever or arm 4 which is rigid with a key 1. When the latter is depressed, a shoulder 9 on the arm 4 rocks the plate 6 further counter-clockwise until the upper edge of the shoulder is latched by a projection 10 on the plate 6. The arm 4 closes contacts 16 in the machine motor circuit to cause an adding cycle. The driving means rotates a disc 17 which is unlocked by an arm 18, rotatable with an arm 24, having a lug 27 normally engaged by a pawl 23 carried by the arm 21. At the end of the cycle, a projection 17a on the disc rocks the arm 18 and hence the arm 21 further clockwise to unlatch the arm 4 and the starting key 1. The arm 18 then relatches the disc 17 and the locking plate 6 is rocked clockwise until a stud 29 therein engages a notch 34 in the secondary lever or arm 28, the upper surface of which is held against the stud 29. Total-taking and transmitting. Depression of the starting key 1 is possible after an adding operation even though no amount key is depressed, since the locking plate 6 is latched by the arm 28. A total-taking and transmitting operation (not described per se) ensues under the control of a shaft 14 which is rocked counterclockwise by the engagement of a stud 11 in the arm 4 with a surface 32 of a forked arm 13 which abuts against an arm 12 fast on the shaft 14. In an adding operation, the arm 28 is rocked clockwise before the arm 4 is depressed and a stud 30 therein engages a surface 31 of the arm 13 to separate the arms 12 and 13, so that the stud 11 passes ineffectively between them. A stud 36 in the arm 12 engages over a shoulder 35 on the arm 28 so that, during the restoration of the mechanism at the end of the cycle, the arm 28 is held back until the stud 29 in the plate 6 can no longer engage the notch 34. Repeated additions. The multiplier is set by a slide 26 having a rack which, when the slide is set, rotates a gear 42 correspondingly. When the gear 42 rotates, a cam 43 thereon rocks the pawl 23 to disengage the arms 21, 24. Thus, at the end of the first cycle, started by operation of the key 1, the machine continues to operate. At the end of each cycle, the rocking of the arms 18 and 24 causes a pawl 47 carried by the arm 24 to engage a ratchet formed on the cam 43 to return the gear 42 through one step. When the machine has performed the required number of cycles, the cam 43 allows the pawl 23 to re-connect the arms 21 and 24 and the arm 21 rocks the locking plate 6 to release the arm 4 and starting key 1 and stop the machine.